Where is openGL render options in 2.8?
It appears they are now where all the render options are - in the Properties Editor, Render Tab: 



It seems you can also set different settings for the viewport when in 'Solid'mode and have different ones for 'Rendered' mode only. You can do that from the header of the 3d Viewport:


OpenGL render is now accessible from the header of 3d Viewport, Viev menu: